Is there any difference in the writing of these two examples in operation?

yamarto · Post time: 2020-3-22 15:00:02

Example2_2.jsp:
<% @ page contentType = "text / html; charset = GB2312"%>
<HTML>
<BODY BGCOLOR = cyan> <FONT size = 1>
  <%! int i = 0;
  %>
  <% i ++;
  %>
<P> You are the first
   <% = i%>
  Customers who visited this site.
</ BODY>
</ HTML>

===============================
(2) Example 3
Example2_3.jsp:
<% @ page contentType = "text / html; charset = GB2312"%>
<HTML>
<BODY>
  <%! Integer number = new Integer (0);
  %>
   <%
      synchronized (number)
      {int i = number.intValue ();
        i ++;
        number = new Integer (i);
  }
%>
<P> You are the first
   <% = number.intValue ()%>
Customers who visited this site.
</ BODY>
</ HTML>

elsaiii · Post time: 2020-6-30 15:45:02

There is no difference, i++ does not need to synchronize, it is an atomic operation itself

yamarto · Post time: 2020-6-30 17:15:01

Oh, thanks....

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